To use [[Validator.nu Web Service Interface|Validator.nu as a Web service]] via GET, the client issues an HTTP request either to <code>https://validator.nu/</code> or <code>https://html5.validator.nu/</code> using the GET method. The IRI (<code>http</code> or <code>https</code>.) of the document to check is encoded as a query string parameter called <code>doc</code>. [[Validator.nu Common Input Parameters|Common parameters]] are also encoded as query string parameters.

To use [[Validator.nu Web Service Interface|Validator.nu as a Web service]] via GET, the client issues an HTTP request either to <code>https://validator.nu/</code> or <code>https://html5.validator.nu/</code> using the GET method. The IRI (<code>http</code> or <code>https</code>.) of the document to check is encoded as a query string parameter called <code>doc</code>. [[Validator.nu Common Input Parameters|Common parameters]] are also encoded as query string parameters.